2.3.1
Data Formats in General Registers
Data of all the sizes above can be stored in general registers as shown in figure 2.3.
Data Type
Register No.
Data Format
7
0
7
6
5
4
3
2
1
0
Don’t care
1-bit data
RnH
RnL
RnH
RnL
Rn
7
0
Don’t care
7
6
5
4
3
2
1-bit data
1
0
7
0
MSB
LSB
Don’t care
Byte data
7
0
Don’t care
MSB
Byte data
LSB
15
0
MSB
Word data
4-bit BCD data
LSB
7
4
3
0
Upper digit
Lower digit
RnH
RnL
Don’t care
7
4
3
0
Upper digit
Lower digit
Don’t care
4-bit BCD data
Legend:
RnH: Upper digit of general register
RnL: Lower digit of general register
MSB: Most significant bit
LSB: Least significant bit
Figure 2.3 Register Data Formats
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